Since Russia’s invasion of Ukraine last week, Chinese social media, usually a controlled space, is rife with conflicting comments about Ukraine. Censors have deleted thousands of posts — many containing vulgar sexual remarks about Ukrainian women — along with the accounts from which they originated. A wide variety of comments are emerging hourly on the chatting platform WeChat; the Douyin video app, or Chinese TikTok; and Weibo, the Chinese version of Twitter. Some social media users are asking the Chinese government to take advantage of the opportunity presented by the Ukrainian crisis to seize Taiwan. China regards the self-ruled island...